1)
3а-5+7>2а -1+7
3a+2>2a+6
a>4
x∈(4;+∞)
2)
3а-5+(4a-3)>2а -1+(4a-3)
3a-5+4a-3>2a-1+4a-3
7a-8>6a-4
a ∈ (4; +∞)
3)
3а-5+(-2a)>2а -1+(-2a)
3a-5-2a>2a-1-2a
a-5>-1
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Answers & Comments
1)
3а-5+7>2а -1+7
3a+2>2a+6
a>4
x∈(4;+∞)
2)
3а-5+(4a-3)>2а -1+(4a-3)
3a-5+4a-3>2a-1+4a-3
7a-8>6a-4
a>4
a ∈ (4; +∞)
3)
3а-5+(-2a)>2а -1+(-2a)
3a-5-2a>2a-1-2a
a-5>-1
a>4
a ∈ (4; +∞)